Venner, who campaigned against gay marriage and Islam, shot himself in the mouth on Tuesday and died 20 minutes later, French reports said.

On Wednesday, the Femen Facebook page called on “European Nazis” to “follow the example of the ultra-right Wenner and immediately commit suicide, thereby permanently excluding themselves from the political arena in Europe.”

It added: “Hurry, on the sacrificial altar of Notre Dame, there is not so much space!”

Femen leader Inna Shevchenko told The HuffPost: "This is a message to all those who support fascism and those who honoured the memory of far-right activist who committed suicide at Notre Dame, including Marine Le Pen."